Ren Ventura

Allow your users (except for administrators) to manually delete their own accounts. It uses the <a href="http://t4t5.github.io/sweetalert/" rel="nofollow ugc">Sweet Alert</a> jQuery plugin for slick-looking alerts and prompts.
By default, this plugin adds a button to a user’s profile page in the wp-admin. You can also add a delete button to any page or post using the <code>[wp_delete_user_accounts]</code> shortcode.
NOTE: Delete buttons are not displayed when logged in as an administrator. This is done to protect against locking yourself out of your site. To see the delete button, you’ll need to log in with an account that does not have the administrator role.
For more technical info, including available hooks (actions and filters), please see the plugin’s <a href="https://github.com/renventura/wp-delete-user-accounts" rel="nofollow ugc">readme file on Github</a>.

WP Delete User Accounts

Funciona perfecto, pide confirmación del borrado y lo hace sin problemas, redirigiendo luego al usuario a la web. 

Desde mayo de 2018 obligatorio ofrecer esto en toda web o e-commerce debido al RGPD de la Unión Europea.

Funciona perfecto, imprescindible para el RGPD

Allow your users (except for administrators) to manually delete their own accounts.

Mads Phikamphon

Almost Users Only is a plugin that limits public access to your blog. Visitors that are not logged in can only view a specific public page. If they are trying to reach other pages they will automatically be redirected to the public page.
If a visitor is logged in, he can view all the pages/posts on the blog (just like if it were a normal WordPress installation).
The public page can for example be used to display information about the site and a guide to how visitors can get an account.
IMPORTANT: WordPress still publish RSS feeds, so posts can still be read that way. Pages should be save though.

Almost Users Only

If logged in, the visitor can view all the pages/posts on the blog. If not logged in, the visitor can only view a specific public page.

WP Delete User Accounts vs Almost Users Only